Go check shortanalytics, you'll see that the majority of trades were buys, even if GNW was falling last week. Very low percentage of shorting activity. Big money was scooping cheap shares and will push GNW back up when they're done loading up.
Shorting a low PE stock like GNW is suicidal. AIG, Warren Buffet, or anybody... is watching and might try to acquire GNW now that it's back down to %40 of book value.
+$8.3 billion in reserve is making GNW a safe as can be.